How many letters does the top answer for “a stone curlew. see under stone.” have?

The most common answer is thickknee (9 letters).

Crossword clue: a stone curlew. see under stone.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

thickknee 9 letters web-def

A stone curlew. See under Stone.

a stone for coping. see coping. 50% similar → copestone

see jade, the stone. 50% similar → jadeite